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| 題 名 | 不同降雨強度與擴散係數對土壤沖蝕之解析=Analysis of Soil Erosion under Varying Rainfall Intensities and Diffusion Coefficients |
|---|---|
| 作 者 | 黃裕仁; 喻柏文; 謝平城; | 書刊名 | 水土保持學報 |
| 卷 期 | 54:1 2024.06[民113.06] |
| 頁 次 | 頁3261-3276 |
| 分類號 | 434.273 |
| 關鍵詞 | 土壤沖蝕; 廣義積分轉換法; 解析模式; 擴散係數; Soil erosion; GITT; Analytical model; Diffusion coefficient; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 土壤沖蝕是農業管理中的長期問題,也是生態系統保育的重要挑戰。為了有效管理和控制 土壤沖蝕,理解其物理過程至關重要;本研究利用廣義積分轉換法,以解析方式改進 HairsineRose 之土壤沖蝕模式(簡稱 H-R 模式),增加考慮的擴散效應與坡度因子,進行求解泥砂濃度的 歷程變化。研究假設在水流均勻、水深定值且坡面均勻沖蝕的情況下進行分析;本解與 Heilig et al. (2001)的實驗進行驗證,發現本解之模擬結果與實驗數據具有一致性。結果顯示,擴散係 數隨坡長的增加而變化;在有降雨條件下,不同的降雨強度均有泥砂濃度於短時間內達到一峰 值後迅速衰退的趨勢,其中強降雨時會更快到達峰值,此現象可反映泥砂被快速帶起的過程。 後續也針對出口處的震盪現象進行討論,經排除解析解精度問題及收斂項數不足的可能性後, 進一步證明了本解析解結果的可靠性。 |
| 英文摘要 | Soil erosion is a long-term issue in agriculture management and a significant challenge for ecosystem conservation. To effectively manage and control soil erosion, it is crucial to understand the physical processes involved. This study utilizes the Generalized Integral Transform Technique (GITT) to derive the analytical solution for sediment concentration after improving the Hairsine-Rose (H-R) soil erosion model by exploring the diffusion effects and slope factors. The analysis assumes uniform flow, constant water depth, and uniform slope erosion. This solution is validated against the experimental results of Heilig et al. (2001), revealing consistency between the simulation results and the experimental data. The results indicate that the diffusion coefficient varies with increasing slope length, and the sediment concentration rapidly reaches a peak value within a short time before quickly declining under different rainfall intensities. Notably, the peak is attained more swiftly under intense rainfall intensity, indicating the swift mobilization of sediments. Furthermore, we discuss the vibration of the solutions near the outlet. After excluding the possibility of precision of the analytical solution and the insufficient number of convergence terms, the reliability of the analytical results was substantiated. |
本系統中英文摘要資訊取自各篇刊載內容。